Left my device to charge while I took a nap but now it’s on the screen when it’s dead and won’t open

My iPad is old (gen 2) today I charged while watching a YouTube video and then I fell asleep. When I woke up the iPad was on the screen when it’s dead, I had 10 batteries before falling asleep and I made sure it was charging. When I woke up I pulled out the cord and it said it was charging as well, I’ve been waiting for a while but it’s still on the dead screen. I don’t know what to do